Note 1 — PART I.

I here make use of these terms, impression and idea, in a sense different from what is usual, and I hope this liberty will be allowed me. Perhaps I rather restore the word idea to its original sense, from which Mr Locke had perverted it, in making it stand for all our perceptions. By the term of impression, I would not be understood to express the manner in which our lively perceptions are produced in the soul, but merely the perceptions themselves; for which there is no particular name, either in the English or any other language that I know of.